Sunnyatlast is right on regarding the continuous dirty dust in spite of all your best efforts. Check with the nice folks that are citizen advocates for recommended companies that effectively do this type of work to air ducts and the results you are now experiencing will change drastically. I don't know if home warranty would have any recommendations for companies that do air duct cleaning but it is true that you must hire a company that is qualified to do the work appropriately and effectively. In addition, steam mops and dust mops do just move the stuff around. A good hepa filter powered vacuum cleaner removes the dust into the unit not into your air space.
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